Chargeback Liability (Tables)

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Rollforward of Estimated Chargeback Liability

The following is a rollforward of our estimated chargeback liability for each of the three years presented in our Consolidated Financial Statements:

	2017			2016			2015
Balance - January 1	$	116.8		$	97.3		$	84.9
Add: Provisions	96.3			106.6			90.0
Deduct: Chargebacks	(92.3		)	(87.1		)	(77.6		)
Balance - December 31	$	120.8		$	116.8		$	97.3